Netflix, 2012. Over 30 million subscribers. An API that stops responding. Every service retries — as it should. In 4 minutes, everything crashes.
The code was technically perfect. Every retry had exponential backoff. Every timeout was configured. And yet, the retry was the weapon that killed the system.
In this episode, we kick off the series "Patterns that Saved Systems" with the most fundamental pattern of distributed architecture: Circuit Breaker.
━━━━━━━━━━━━━━━━━━━━━━━━━━
📐 WHAT YOU'LL LEARN
━━━━━━━━━━━━━━━━━━━━━━━━━━
→ Why retries cause cascading failures
→ The 3 states of the Circuit Breaker: CLOSED → OPEN → HALF_OPEN
→ Complete implementation in Python (code you can copy)
→ Real metrics: from 4 hours of recovery to 90 seconds
→ 3 uses of the Circuit Breaker in scraping architectures
→ The cases of Amazon S3 (2017) and Cloudflare (2019)
━━━━━━━━━━━━━━━━━━━━━━━━━━
📋 SERIES: PATTERNS THAT SAVED SYSTEMS
━━━━━━━━━━━━━━━━━━━━━━━━━━
Ep.1 → Circuit Breaker (Netflix) ← you're here
Ep.2 → Dead Letter Queue
Ep.3 → Bulkhead (Titanic → AWS)
Ep.4 → Retry with Jitter (Amazon DynamoDB)
Ep.5 → Backpressure (Twitter)
Ep.6 → Saga Pattern (Microservices)
"The logic was perfect. The system failed anyway."
━━━━━━━━━━━━━━━━━━━━━━━━━━
🔔 ABOUT THIS CHANNEL
━━━━━━━━━━━━━━━━━━━━━━━━━━
Software architecture from the trenches. Real trade-offs, war stories, and patterns that work in production — not in slides.
#CircuitBreaker #SoftwareArchitecture #Netflix #DistributedSystems #Microservices